I just bought a two story home with zoned heat/AC. Ceiling in living area, where downstairs thermostat is located, is two stories high. The heat will come on and run for a while, and shut off. A few minutes I hear the furnace
light up, the blower comes on and runs for 10 seconds before shutting off.
This goes on all day. I thought it might be a bad thermostat, so replaced it with a new one. Problem still exists. I have tried all sorts of different ideas.
Is there some trick to setting the upstairs thermostat at a particular degree, and the downstairs at another? This is driving me crazy!